Electronically operated advertising and sound reproducing apparatus



Oct. 28, 1952 M, A CARTER 2,615,993

ELECTRONICALLY OPERATED ADVERTISING AND SOUND REPRODUCING APPARATUSFiled Sept. 26, 1950 8 Sheets-Sheet l 'lli FOR I DEM'ONSTRATION OF THEUTOMA 4l ALES 1422 I| .N

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IN VEN TOR. l MELA/IN A CARTBR Oct 28, 1952 M. A. CARTER 2,615,993

' ELECTRONICALLY OPERATED ADVERTISING AND SOUND REPRODUCING APPARATUS 4Filed Sept. 26. 1950 8 Sheets-Sheet 2 A INVENTOR. MELVIN A. @ARTER BY-gOct. 28, 1952 M. A. CARTER 2,615,993

ELECTRONICALLY OPERATED ADVERTISING AND SOUND REPRODUCING APPARATUSFiled sept. ze, 195o s sheets-sheet s IN V EN TOR. Msn/m CAR TER Oct.28, 1952 M. A. CARTER ELECTRONICALLY OPERATED ADVERTISING AND SOUNDREPRODUCING APPARATUS Filed Sept. 26, 1950 180 17? f5? la@ 8Sheets-Sheet 4 LQ@ o J \`/7/LJ75 C) o 173-: O 18 /f o o o INVENTOR. MmmACARTER .Affi/9275) Oct. 28, 1952 RTER I 2,615,993

M. A. CA ELECTRONICALLY OPERATED ADVERTISING AND SOUND REPRODUCINGAPPARATUS Filed Sept. 26, 1950 8 Sheets-Sheet 5 JNVENToR. Mmmm A. CARTERffii/751V .nunnu Oct. 28, 1952 M. A. CARTER 2,515,993

ELECTRONICALLY OPERATED ADVERTISING AND SOUND REPRODUCING APPARATUS 8Sheets-Sheet 6 Filed Sept. 26, 1950 ML mh www Eozmanw ...um nuratm-.room

INVENTOR.

Dn m m C .A m w E M M. A. CARTER ELECTRONICALLY O Oct. 28, 1952 8Sheets-Sheet '7 Filed sept. 26, 195o m R. T 0 R vz z l Nmmi m Q n E V UL N .An f www., h WNDN k Ew m N M NN m5 l Iv b, V Y M i, N Y DD Sn mwNmm( 1dr: wm/m @n k x BSN ,NL L. N/J m z Oct. 28, 1952 M. A. CARTERELECTRONICALLY O PERATED ADVERTISING AND SOUND REPRODUCING APPARATUS 8Sheets-Sheet 8 Filed Sept. 26, 1950 NEN.'

iw, www mw ww kmwvh, umh www www. uw. mh mmh mmm www Sm QS Im NSPatented Oct. 28, 1952 ELECTRONCALLY OPERATED ADVERTIS- ING AND SOUNDREPRODUCING APPA- RATUS Melvin A. Carter, Erooklyn, N. Y.

Application September 2t, 15h50, Serial No. 186,859

li) Claims. 1

This invention relates to new and useful improvements in ascundreproducing apparatus for transcribing messages from a record on whichthe'messages are recorded and separated from each other by a signalrecorded above the frequency of the messages. While the presentapplication of the invention is designed primarily for use with discrecords, it is appreciated that the teachings of the present inventionare equally well adapted for transcribing messages recorded oncylindrical records or on elongated tapes r wires or the like withoutdeparting from the scope of the present invention,

More particularly, the present invention proposes the construction of anovel sound reproducing apparatus which will nd many different uses inbusiness, industry, education and other fields, but which isparticularly well adapted to sales promotion work or for use inaudio-visual education programs. The present illustration shows thedevice as adapted for use in sales promotion work, but such illustrationis merely indicative of one of the many possible adaptations of thepresent invention.

Still further, the present invention proposes characterizing thereproducing apparatus by an amplifier circuit innuenced by atranscribing arm having a needle engaging the groove of the record so asto successively7 play the recorded messages through different speakersor to play the messages one after another through only a main speaker,as desired.

A further object of the present invention'is to construct the apparatusto be automatic in its operation to play the messages in either of thetwo ways set forth in the preceding paragraph in accordance with manualsettings of a twoposition changeover switch.

Another object of the present invention proposes constructing theamplifier circuit to include a signal relay to be influenced by thesignals recorded on the record in a manner to operate a control circuitto Vary the speaker through which the next successive message will beplayed in the one position of the changeover switch or to energize anormally open shut-off relay to break the amplier circuit in the otherposition of the changeover switch.

A still further object or" the present invention proposes connecting astepping switch in series with the speakers and the said one position ofthe changeover switch to be operated by a change relay which isenergized by said signal relay througha supply relay in a manner tocause the stepping switch to be advanced one position each (Cl.17E-400.4)

time the signal relay is energized by a signal from the record.

The present invention further proposes a master relay for controllingenergization of the amplier circuit and to arrange the master relay in acircuit which includes a source of electrical energy in such a mannerthat when the master relay is once energized it will retain itselfenergized energizing the amplifier circuit until such time as the masterrelay circuit is broken by energization of a reject solenoid in the oneposition of the changeover switch or by energization of the shut-01Trelay in the other position of the changeover switch.

Still another object of the present invention proposes constructing thereproducing apparatus so that the reject solenoid, which is connected tothe reject arm of the record player, will be energized by a secondstepping switch connected to move in unison with said rst steppingswitch in a manner so that both of said stepping switches are moved bythe change relay causing the reject arm to move th-e transcribing armback to its starting position on the record.

A further object of the present invention proposes connecting a normallyclosed switch in the circuit with the master relay and arranged to beopened by the reject arm when the reject solenoid is energized in amanner to break the circuit through the master relay in the one positionof the changeoverswitch.

The present invention still further proposes to arrange a manuallyoperable selector switch for varying the number of messages that will beplayed through successive speakers and when the reject solenoid will beenergized in the one position of the changeover switch.

Another object of the present invention proposes providing thereproducing apparatus, particularly when adapted to sales promotionwork, with a sign connected in the circuit in such a manner that thesign will be caused to periodically blink in the inoperative position ofthe amplier and caused to be continuously illuminated when the amplifieris in operation.

A still further object of the present invention proposes a reducedvoltage circuit controlled by a foot pad or an auxiliary hand operativeswitch for controlling initial operation of Said master relay in amanner to energize the amplifier circuit and thereafter maintain itselfenergized until later deenergization occurs in accordance with either ofthe two methods previously outlined.

A further object of the present invention pro'- poses main input linefor supplying current to the reduced voltage circuit and the amplifiedcircuit and controlled by a manually operable master switch in a mannerso that the entire apparatus can be shut off by opening that masterswitch.

Still another object of the present invention proposes the provision ofa filament transformer having its secondary connected in parallel withthe heaters of the tubes of the amplifier circuit and its primaryconnected in series with the input line so that when the master switchis closed the heaters will be enrgized so that the amplifier circuitwill be ready for instant operation when the master relay energizing theremainder of the amplifier circuit is closed.

The invention further proposes the provision of a turntable upon whichthe record is to be placed and a motor for turning that turntable andconnected in the amplifier circuit in such a manner that the turntablewill be instantly energized when the master relay is energized.

It is a further object of the present invention to construct a soundreproducing apparatus for carrying out the foregoing objects which issimple and durable and which can be manufactured and sold at areasonable cost.

For further comprehension of the invention, and of the objects andadvantages thereof, reference will be had to the following descriptionand accompanying drawings, and to the appended claims in which thevarious novel features of the invention are more particularly set forth.

In the accompanying drawings forming a material part of this disclosure:

Fig. 1 is a diagrammatic view of the complete sound reproducingapparatus constructed in accordance with the present invention.

Fig. 2 is a rear elevational view of the control box of the soundreproducing apparatus.

Fig. 3 is a plan view of the control box, but with the top covercompletely removed.

Fig. 4 is an end elevational view of the control box looking from theleft-hand side of Fig. 1.

Fig. 5 is a greatly enlarged partial vertical sectional view of thecontrol box taken through the center of the selector switchsubstantially on the line 5 5 of Fig. 3.

Fig. 6 is a horizontal sectional view taken on the line 6 6 of Fig. 5.

Fig. 7 is a partial horizontal sectional view Y taken on the line 7 1 ofFig. 5.

Fig. 8 is a partial vertical view taken on the line 3 8 of Fig. 5.

Fig. 9 is a vertical sectional view taken on the line 9 9 of Fig. 8.

Fig. 10 is a partial elevational view looking in the direction of theline |l) l of Fig. 8.

Fig. 11 is an enlarged partial horizontal sectional view taken on theline Il ll of Fig. 5.

Fig. 12 is an enlarged sectional View through one of the contacts of thestepping switches taken on the line |2 l2 of Fig. 9.

Fig. 13 is an enlarged partial plan view of the foot pad with portionsthereof broken away to reveal interior constructions.

Fig. 14 is a partial vertical sectional view taken on the line M Ill ofFig. 13.

Fig. 15 is an enlarged detailed view of a portion of Fig. 14.

Figs. 16 to 18 are portions of a schematic wiring diagram of the presentinvention. With the sheet having Fig. 16 laid fiat, the sheet havingFig. 17 is positioned to the right of the sheet .having Fig. 16 and thesheet having Fig. 18 is positioned to the right of the sheet having Fig.

l 17. In those positions of the sheets the reference letters along thevertical edges of the figures will match-up denoting continuations ofthe various electric leads as they pass between the several figures ofthe schematic wiring diagram.

The sound reproducing apparatus, according to the present invention, iscomprised of the following main parts; a control box 25, an electricsign 25, a foot pad 2l and a group of auxiliary speakers 28. On Figs. 1and 18, the group of auxiliary speakers 28 is shown as being comprisedof five such speakers but it will be appreciated, as this specificationproceeds, that showing is by way of illustration only and that theirnumbers can be increased or decreased in accordance with the number ofindividual messages recorded on the disc record to be ,hereinafterdescribed.

The control box 25 forms the heart of the present apparatus and enclosesmost of the parts shown in the schematic v'wiring diagram of Figs. 1lito 18 with the exception, of course, A.of those parts shown externallyin Fig. 1. The control box 25 comprises a hollow box body 29 made ofwood or other decorative electrical insulation material and has an opentop closed by a hollow cover 3i) made of the same material as the boxbody 29. The cover 3u is pivoted to the rear top edge of the box body 29by several hinges 3|, see Figs. 1, 2 and 4, so that the cover canbepivoted between open and closed positions. v

The control box 25 has the interior of its body 29 divided into twoadjacent halves by a vertical wall 32, see Fig. 3. The right half of thebox body 29, as viewed in Fig. 3, encloses a conventionally constructedrecord player 33 including an intermediate wall 32 supported at anelevation below the open top of the box body 29. Supported to rotateslightly above the top face of the intermediate wall 34, there is aturntable 35 across which a pivotally mounted transcribing arm 35 is torno-ve. Provided to be rested on the turntable 35, as is generally knownin the art, is the usual disc record 37, see Fig. 3. The free end of thetranscribing arm 36 carries the usual needle 38, see Fig. 17, forengaging the spiral groove of the record 2'! to advance along thatspiral groove as the record turns. Recorded on the surface of the record3l there is a plurality of successive messages which are separated onefrom the other by a signal recorded at a frequency above the frequencyat which the messagesare recorded. The purpose for the signals willbecome clear as this specification proceeds, it being sunicient toexplain at this time that the signals might be any desired sound,produced by shouting, whistling, clapping two sticks together or anysimilar sound, carefully recorded at the desired elevated frequency.

The record player 33 further includes the usual reject arm 39 locatedbelow the intermediate wall 3L! and diagrammatically illustrated in Fig.16. The reject arm 39 has a control button lli) extended upward throughthe wall 34 through an elongated slot M, see Fig, 3, by which the rejectarm 3Q can be manually operated for returning the transcribing arm 33 toits starting position on the record 3l, all as generally known in theart of automatic record players. Further constructional details of therecord player 33 and its reject arm 39 will not be given in thisspeciiication as such details are generally known in the art and form nopart of the present invenion.

The turntable 35 and the recordings of the disc record 37 may be made toturn at 33, 45 or 78 R. P. M., as desired, but it has been found thatthe size of the control box can be kept to a minimum and the number ofmessages recorded on the record kept at a. maximum for the size of thecontrol box, if the record player is one of the type which operates at33 R. P. M.

The left half of the box body 29 is closed by a wall 52 arranged at alevel with the top of the box body, as shown in Figs. 1 and 4. The wall42 is releasably retained in position by several screws 43 and has onthe top face thereof the various control knobs and the like of thereproducing apparatus which will be hereinafter described. The verticalwall 32 extends only between the intermediate ywall =34 and the wall 42so that the lower portion of the interior of the box body 23 isunobstructed for the passage of electric wires between the halves of thebox body.

The front wall 44 of the box body 23, below the wall 42, is formed withan opening closed by a grille 45, see Figs. 1 and 4, behind which thereis mounted a main speaker 46 diagrammatically illustrated in Fig. 1.8.The rear wall 41 of the box body 2S extends only part way to the bottomof the box body forming a rear opening 48, see Fig. 5, which is closedby a metallic container 49 mounted in position on the outer -face of therear wall 41 over the rear opening 48. The container 49 is mounted inposition by removable screws 53 and provides a mounting on its rear wallfor certain of the electrical parts to be hereinafter referred to. Atspaced points on its top, rear and end walls, the container 49 hasscreens 5l mounted therethrough, see Figs. 2 to 4, for venting heatgenerated Within the control box 25.

For a further description of the sound reproducing apparatus, particularreference will be had to the schematic wiring diagram-Figs. 16 toiii-from which it will be noted that the apparatus includes an amplifiercircuit shownin Figs. 17 and 18. That ampliiier circuit is controlled bya master relay 52 of the double-poledouble-throw type. The master relay52 includes a coil 53 for moving a core in one direction when energized.The core is connected to a pair of arms 54 and v55. When the coil r53 isdeenergized, the arm 54 is closed against a blank contact 5S and the arm5K5 is closed against a contact 51. When the coil 53 is energized, thearm 54 is closed against a Contact 58 and the arm 5-5 is closed againsta contact 59.

Novel means is provided for energizing the coil 53 of the master relay52 for closing the arms 54. and 55 against the contacts 5.8 and 59. Thatmeans comprises a plug G, see Figs. 1 and 16, for insertion into aconventional receptacle of a source of 110 volt A. C. electrical energy.Extending irorn the plug 68 there are leads 5I and connected to theprongs 53 of a second plug 64. The prongs E3 of the plug 34 are arrangedto be received in a 110 volt input receptacle 55 mounted through therear wall of the container 4S, see Fig. Extending from one side of thereceptacle E5, there is a lead 66 which is connected at its other end tothe coil '53 of the master relay 52, Connected in series in the lead S5,there is a manually operable master switch 61. The master switch 61, asshown in Figs. 1 and 3, is mounted through the top wall 42 of thecontrol box 25 to be thrown manually between on and oif positions tocontrol the supply of all electrical energy to the sound reproducingapparatus. Between the coil 53 of the master relay 52 and the masterswitch 61, the lead 66 has a grounded branch lead 68.

Extending from the other side of the receptacle 65, there is a lead -69which is connected to one side of the primary 10 of a step-downtransformer 1|. The other side of that primary 1l) is connected by alead 12 to the lead 66 on the inward side of the master switch 61. Thus,when the master switch 61 is closed the primary 10 o f the transformer1l will be energized along the lead 6l, the lead 6B, the lead 12, theprimary 1u, the lead 69 to the lead 62.

The step-down transformer 1l is provided for supplying a reduced currentvoltage to operate the 6 volt coil 13 of a normally open control relay14. The control relay 14 has an arm 15 arranged to be closed against acontact 16 when the coil 13 of the control relay 14 is closed. Thestepdown transformer 1l acts to step down the normal 110 volt current to5 volts the current at which the coil 13 of the control relay 14 isdesigned to operate. The secondary 11 of the transformer 1I ascontrolled by the foot pad 21 will supply the current for energizing thecoil 'I3 of the control relay 14.

Constructional details of the foot pad 21 are illustrated in Figs. 13 to15 and from which it will be noted that the pad is comprised ofsuperimposed wire screens 18 and 13 separated from each other by a thinlayer of insulation material 88. The layer of insulation material 83 ispreferably a thin sheet of paper and at spaced points, the layer isprovided with holes 8l, see particularly Figs. i3 and 15. Extended alongthe top face of the top screen 18 there is a thin layer of insulationmaterial 82 preferably of paper and Y extended along the bottom face ofthe bottom screen 13 there is a thin layer ofinsulation material S3preferably of paper. The entire sandwich composed of the screens 18 and19 and the layers of insulation material 88, 82 and 83 is housed withina casing 8d of rubber molded about the same. The top face of the rubbercasing 84 is provided with upwardly projected ribs 85 providing a gripfor a person standing on the pad. The foot pad 21 is provided to bepositioned on the floor in front of the sound reproducing apparatus tobe stepped on by a person desiring to start a cycle of operation of theapparatus by energizing the master relay 52.

Due to the resilient nature of the casing 84, the weight of the personstepping on the foot pad 21 will cause the screens 18 and 19 to bedeformed through the holes 8l in the layer of insulation material 80 andelectrically contact one another. Extending from the upper screen 18there is a lead 86 and extending from the lower screen'19 there is alead 81.

Referring again to the schematic' wiring diagram, Figs. 16 to 18, itwill be noted that the leads 83 and 81 from the foot pad 21 areconnected to the prongs 88 of a plug 89. The prongs 88 of the plug 88are arranged to be received in a receptacle 90 mounted through the rearwall of the metallic container 49, see Fig. 2. Extending from one sideof the receptacle Sil there is a lead 9| which is connected to one sideof the secondary 11 of the transformer 1l. A lead 92 extends from theother side of the secondary 11 to one side of the coil 13 of the controlrelay 14. A third lead 93 extends from the coil 13 to the other side ofthe receptacle 9D. The use of the plug 89 and the receptacle 90 permitsthe foot pad 21 to be separated from the control box 25 when moving theapparatus or for making repairs.

With the primary 10 of the step-down transformer 1I energized, the coil13 of the control relay Y11| will be -energized if the screens 18 and 19are contacted, by the passage of current along the `lead 86, the lead9|, through the secondary 'I1 of the transformer 1|, the lead 52, thecoil 13, the lead 93 and Ithe lead 81 back to the foot pad 21.

It will be appreciated, of course, that a 6 Volt current is used in thecircuit for the coil 13 of the control relay 15 to eliminate possibleelectrocution of the person stepping on the foot pad especially with wetshoes and if the casing should be Worn away unnoticed exposing the topscreen 18 to contact by such wet shoes.

Auxiliary means is provided for closing the 6 volt circuit through thecoil 13 of the control relay 14 without requiring stepping on the footpad 21. That auxiliary means comprises a lead 94 connected between theleads 9| and 93 in shunt of the foot pad 2l. Connected in series in thelead S4 there is a normally open auxiliary switch 95 of the depressiblesnap-action type. As shown in Figs. 3 and 4, the auxiliary switch 55 ismounted through the top wall i2 to be manually depressed. When theswitch 95 is closed by being depressed the coil 13 will be energized bycurrent passing from the secondary 11 along the lead 9|, the lead 94through the switch 55, the lead 53, the coil 13, the lead 92 back to theother side of the secondary 11 of the step-down transformer 1|.

Normally, the arm 15 of the control relay lll is spaced from the contact15 and is connected by a lead 96 to the other side of the coil 53 of themaster relay 52. Extending from the contact 15, there is a lead El whichis connected to the lead 69 from the source of electrical energy,between the receptacle 55 and the primary l0. Thus, with the masterswitch |51 in the on position and the arm 15 of the control relay 1liclosed against :the contact 15, the coil 53 of the master relay 52 willbe energized by current passing through the lead 6|, the lead 56, thecoil 53, the lead 95, the arm 15, the contact 16, the lead 01, the lead69 and the lead 62 back to the source of electrical energy. When thecoil 53 of the master relay 52 is closed, the arms 56| and 55 will bepivoted away from the contacts 55 and 51 and closed against the contacts58 and 59.

The electric sign 26, as will be determined from Figs. 1 and 16,includes a hollow base 98 of metal or similar material and whichencloses a pair of series connected light bulbs S0, see Fig. 16.Upstanding from the base 98, there is a transparent plate |55 formed ofglass, a transparent synthetic The bottom edge resin or other similarmaterial. portion of the transparent plate |00 is supported in a slot,not shown, formed in the base 98 over the light bulbs 99 so that theplate will be illuminated by rays of light passing from the bulbs 99.The surface of the transparent plate |50 has imprinted thereon orotherwise applied thereto certain indicia |0|. When the soundreproducing apparatus is constructed for sales promotion work as shownon the drawings, the indicia preierably comprises instructions forstarting an operation oi the apparatus-referred to on the sign as anAutomatic Salesman-by stepping on the foot pad 21. Gther constructionaldetails of the sign 26 will not be given in this specication as suchdetails are generally known by those skilled .in the art and form nopart of the present inven- `26 to be litand periodically blinked whilethe master relay .52 is deenergized and the master switch 61 is in itsclosed position. The operative parts of that circuit means arediagrammatically illustrated in Fig. 16 and are comprised of a signmotor |02 having a cam |03 including a high point |04, mounted rlxedlyon its driven shaft so that the cam |03 will be rotated by the motor|02. The cam |03 is designed to operate a flicker switch |05 having apair of contacts |06 and |01. The contact |05 is stationarily mountedand normally engaged by the contact |00 which is mounted on anintermediate portion of an arm |08 of insulation material. The arm |08is pivoted at one end on a pin |08*iL and has its other end resting onthe cam |03. The arm |08 is resiliently urged by a leaf spring lb, intoa p0- sition in which its contact |01 engages the contact |06 and thefree end of the arm rests against the cam |03. Thus, during eachrevolution of the cam |03, the high point |04 will engage the arm |03and pivot it against the leaf spring |08b causing the contact |00 tomomentarily move away from the contact |01 opening the flicker switch|05. The sign motor |02 preferably includes some gear reductionmechanism, not shown, or similar mechanism for reducing the rate ofrevolution of the cam so that the cam |05 will make one completerevolution once every eleven seconds causing the flicker switch |05 tobe opened once every eleven seconds.

The electrical connections for illuminating the sign 25 and Yoperatingthe sign motor |02 during the time that the master switch 81 is closedand the coil 53 of the master relay 52 is deenergized, includes a lead|59 which is connected at one end to the lead 91 between its connectionwith the contact 'l5 and its point of connection to the lead |50. Theother end of the lead |09 is connected to the arm 55 of the master relay52 which is engaged with the contact 5l in the deenergiaed position or"the relay. A lead ||0 from the contact 51 is connected at its other endto one side of the sign motor. A lead from the other side of the signmotor |02 is connected to the lead 55 on the inward side of the masterswitch 5l'. Thus, current for rotating the motor will pass through thelead 5|, to the lead 65. through the closed master switch 51, along thelead Hl, through the sign motor |02, along the lead H0, to the contact51, through the arm 55, along the lead |09, the lead 91, the lead 69 andinto the lead 62 back to the source.

Simultaneously, the sign 20 will be illuminated through the medium ofleads ||2 and ||3 which extend from the series connected light bulbs 99mounted in the base 0&5 of the sign. The leads ||2 and H3 are connectedto the prongs ||l| of a plug H5. The prongs El@ are arranged to beinserted into a sign outlet receptacle |0 mounted in position throughthe back wall of the metallic container 619, see Fig. 2. The use of theplug H5, as in the case or" the plugs and 89 previously referred to,permits the sign 26 to be completely disconnected from the control box25 when desired. A lead ||1 extended from one side of the receptacle H0is connected to the lead between the sign motor |02 and its point ofconnection with the lead 65.

Another lead H3 from the other side of the receptacle ||6 is connectedto the contact |01. A lead H9 connected at one end to the contact |06 isconnected at its other end to the lead ||0 between the sign motor |52and the contact 51. Again, with the master switch 61 closed and the coil53 of the master relay deenergized, the sign will be illuminated bycurrent rpassing through the lead 6|, through the closed master switch61 and the lead 65 to the lead |I through the lead I |1, the lead I 2,through the light bulbs 99, along the leads ||3 and |8, through theclosed contacts |06 and |01, the lead H9 and the contact ||0 to theContact 51 and from that contact back to the source along the same pathas that described for the sign motor. In the position of the arm 55shown in Fig. 16, the sign 20 will be illuminated as long as thecontacts |06 and |01 engage one another. However, the moment the highpoint |04 on the cam |03 engages the arm |08, it will be pivoted againstthe action of the leaf spring |081 momentarily spacing the contacts |08and |01 breaking the circuit through the sign causing the sign to bemomentarily turned off. A circuit, to be hereinafter described, is alsoprovided for causing the sign to be continuously illuminated during thetime that the coil 53 of the master relay 52 is energized.

Included in the circuits of the reproducing apparatus, there is amanually operable changeover switch which can be set in either of twopositions for changing the nature of the operation of the apparatus-thatis whether the messages are to be played through the main speaker 46 andthe auxiliary speakers 28 or whether the messages are to be played oneafter the other through only the main speaker 46,

as will become clear as the specification proceeds.

The construction of that changeover switch |20 is diagrammaticallyillustrated in Fig. 18 and consists of superimposed concentricstationary rings 2| and |22 of insulation material. Positionedconcentrically within each of the rings |2I and |22 there are discs |23and |24 also of insulation material. The discs |23 and |24 are gangedtogether by a vertically extended rod, indicated by the dotted line I 25in Fig. 18, so that as the rod is turned in one direction or the otherthe discs |23 and |24 will be similarly turned with relation to therings |2I and |22. With the rings |2I and |22 xedly supported on thebottom face of the tcp wall 42, the top end of the rod |25 is turnablyextended through that top wall and has a knob |26 mounted on that topend over the top face of the top wall 42. The knob |26 includes apointer |21 which registers on an indicator plate |28 inscribed with thenumerals 1 and 2, see Figs. 3 and 18, for indi- K eating which of thetwo possible positions the changeover switch 20 is in. Preferablyprovided in connection with the rod |25, but not shown on the drawings,there is means for limiting rotational or turning movements of the rod|25 to the two positions indicated by the numerals on the indicatorplate |28.

Fixedly mounted on the ring |2I, there is a radially extended contactstrip |29 which has its inner end extended to make electrical contactwith a contact ring |30 stationarily mounted on the disc |23. At -onepoint, the contact ring |30 is formed with a radially extendedprojection |3| which makes electrical contact with a radially extendedcontact strip |32 lxedly mounted on the ring |2|, when the pointer ofthe knob |28 is set to the number l position, as shown in Fig. 18. Whenthe knob |28 is turned to the number 2 position, the ring |23 is thenturned causing the projection |3| to make electrical contact with asecond contact strip |33 which is also radially extended andstationarily mounted on the ring |2|. The contact strip |29 is engagedwith the contact ring |30 in either of the two turned positions of thedisc |23.

Turning now to the bottom ring |22, there is stationarily mounted ondiametrically opposite sides of the ring |22 radially extended contactstrips |34 and |35. Mounted on Ithe disc |24 there are opposed halfrings |38` and |31 of metallic material. The strips |34 and |35 are alsoconstructed of metallic material and the inner end of the strip |34contacts the half ring |36 and the inner end of the strip |35 contactsthe half ring |31. At one point the contact ring |36 carries a radiallyextended projection |38, which in the number l position of thechangeover switch |20, makes electrical contact with a radially extendedmetallic -contact strip |39 stationarily mounted on the ring 22.However, when the changeover switch is turned to its number 2 position,the projection |38 merely moves away from the contact strip |39 breakingits electrical contact with that strip and moves to an idle positionbetween the contact strips |34 and |39. The contact strip |34 makescontacts with the half ring |36 in each of the two positions of thechangeover switch. The other half ring |31 is also formed at one pointwith a radially exended projection |40 which contacts a radiallyextended metallic vcontact strip |4| lxedly mounted on the ring |22 inthe number l position of fthe changeover switch |20, as shown in Fig.18. When the changeover switch is turned to its number 2 position, thedisc |24 is turned causing the projection |40 to move over and makeelectrical `contact with a second radially extended metallic contactstrip |42 mounted on the ring |22. The inner end of the contact strip|35 makes electrical contact with the half ring |31 in each of the twopositions of the changeover Switch |20. All the electrical connectionsto the changeover switch 20 will be hereinafter described.

Provided for controlling the number of auxiliary speakers 28 that willbe in operation when the changeover switch |20 is in its number 1position, there is a selector switch |43 which is manually operable tobring one or more of the auxiliary 'speakers 28 into operation. Theselector switch |43 is diagrammatically illustrated in Fig. 18 andIconstructional details of that switch are shown in Figs. 5 to 12. Theselector switch |43 is divided into two main parts-the manually settablepart and the electrically operated part.

First, reference will be had to the manually settable part which iscomprised of a, metallic plate |44 which at its center is formed with anintegral sleeve |45 projected upward through a hole formed in the topwall 42, see Fig. v5. Positioned on the top face of the top wall 42,concentric with the sleeve |45, there is an indicator disc |48 with anut |41 threaded onto the projected top end of the sleeve |45 andagainst the disc |46 iixedly securing the plate |44 and the Iisc |45 inposition with relation to the top wall The exposed face of the indicatordisc |46, as shown in Fig. 3, is inscribed with the legend off and thenumerals from l to 5 all equally spaced about the disc |45. Positionedon the sleeve |45 and rested on the nut |41, there is a metallic strip|48 which extends radially from the sleeve and has its free end bentupward forming a stop member |49. The strip |48 is retained in a desiredxed position on the sleeve |45 by a second nut |50 threaded onto the topportion of the sleeve and against the top face of that metallic strip|48. The nut |50 acts in the nature of a lock nut for the nut |41insuring secure mounting for the plate |44,

lli

Ro'tatively extended through the sleeve |55 there is a shaft which hasits top portion projected above the top end of the sleeve 145. Fixedlymounted in position on the projected top end portion of that shaft |51there is a knob |52. The knob |52 is secured in position by means of aset screw |53 threaded through the side of the knob |52 and tightenedagainst the side of the shaft 15|. One side of the knob |52 is formedwith a projection |55 for registering with the legend off or the numbersinscribed on the face of the indicator disc 1116. The metallic strip |46is secured in position on the sleeve |45 so that its stop member |59will be engaged by the side of the projection |55 when aligned with thelegend off so as to limit further turning of the knob |52 in acounterclockwise direction, as viewed in Fig. 3. Y Y

Spaced below the plate 155, there is a circular wall |55 of insulationmaterial having a hole 156 at its center and having four equally spacedears |56 projected radially from its periphery. Depending from thecorners of the plate |114 there are four bolts |51 which pass throughholes formed in the outer ends of the ears |56. For retaining thecircular wall |55 in the desired spaced position with relation to theplate |54, there is positioned on each of the bolts |51 a bushing |53between the adjacent faces of the plate |44 and the circular wall |55.

Positioned below the circular wall 155 there is an L-shaped member |59having a horizontal arm 159a and a depending vertical arm |591. Thehorizontal arm 15|!a is formed with holes for the passage of the bottomend portions of the bolts |51 and the L-shaped member |59 is retained inthe desired spaced position with relation to the bottom face of thecircular wall |55 by means of tubular bushings 155 positioned on thebolts |51 between the adjacent faces of the circular wall |55 and thehorizontal arm |59a of the L-shaped member. For retaining the circularwall 155, the L-shaped member |59v and the bushings |58 and |65 inpositi-on on the bol-ts, nuts 15| are threaded onto the bottom ends ofthe bolts |51 and against the bottom face of the horizontal arm 159e ofthe L-shaped member |59.

Rotatively positioned within the hole |56 of the circular wall |55,there is a disc |52 of insulation material which is xedly mounted on thebottom end of the shaft 151 to rotate therewith as the shaft |51 isturned through the medium of the knob |52. Fixedly mounted on the bottomface of the circular wall 155 concentric with its hole |56, there is ametallic contact ring |63 which at one point is formed with a radiallyextended projection |53a for having an electric lead connected theretoas will be hereinafter described. Fixedly mounted on the circular wall|55, outward of the contact ring |63, there are six contact strips |65,|65, |66, |61, |68 and |69. The contact strips |65 to |69 are all madeof metal and are alike in formation and have their inner ends curved toextend downward beyond the bottom face of the contact ring |53 so as notto make electrical contact therewith, as shown in Fig. 5.

Fixedly secured to the bottom face of the disc 152 there is a metalliccontact ring 11E) which is formed at one side thereof with a spaced pairof radially outwardly extended projections |11 which make electricalcontact with the contact ring |55. Secured to the bottom face of thecontact ring 116, there is a metallic half ring |12 which is formed witha radially outward extended projection 115, which in Figs. 5, 6 and 18is shown in atiac 12 electrical contact with the inner end of thecoritact strip |5f'1-the position of the parts when the knob |52 of theselector switch 155 is at the off setting shown in Figs. 3 and 5. As theknob |52 is turned to the number l position of the selector switch, theprojection` 1 'i3 will make electrical contact with the contact stripand in the number 2 position with the contact strip 156 and so arounduntil in the number 5 f position the projection will be contacted withthe strip |55. The projectionsv111 of lthe contact ring 115 makeelectrical contact with thecontact ring 153 in all of the set positionsof the selector switch 155.

Means is provided for retaining the shaft `|51 in any position in whichit might be turned and for in turn retaining the disc 152 in a fixedposition in which the projection |13 will be electrically contacted withthe inner end of one `of the contact strip 1% to |59. rihat retainingmeansvcomprises a small wheel |15 which is xedly mounted on the shaft|51 between the adjacent facesof the top wall 52 and the metallic plate|4145.` The periphery of the small wheel |111 is formed with six equallyspaced notches |15. An elongated leaf spring |15 has one end securelyanchored to one of the bushings |55 and its other end bent into asemicircular end portion 111 which fits into one of the notches |15. Asthe shaft |51 is turned, the semicircular end portion |11 snaps into andout of the notches restraining the shaft 15| against free rotativemovement and so holds the shaft in any position into which it is turnedthrough the medium of the knob 152. l

Constructional details of the electrically,operated part of the selectorswitch 153 are given in Figs. 5 and 8 to l2 with a diagrammaticillustration of that part in Fig. 13. That electrically operated part iscomprised of a U-shaped frame 113 which is turned on its side to have atop arm |155, a bottom arm |151j and a vertically disposed intermediatearm 115C. The U-shaped frame v|18 is positioned against the dependingvertical arm |55b of the L-shaped member |55. Welded to the outer facesof the arms 115a and 118|] of the U,- shaped frame 118, adjacent thevertical arm 159|?, there are angle irons 115. The vertically extendedarms of the angle irons |19 are secured to the vertical arm 1554b byspaced screws 155.

Concentrically rotatively extended through the intermediate arm 115 ofthe LJ-shaped frame |15, there is a horizontally disposed shaft 18|.Mounted on the end of that shaft V|81 on the inner face of theintermediate arm |182, there is a ratchet wheel |52 secured in positionby a pin |53, see Fig. ll. The periphery of the ratchet wheel 152 isformed with a plurality of teeth shown cn the drawings as comprisingtwenty such teeth. The use of twenty teeth is arbitrary and their numbercan be increased or decreased as controlled by the maximum number ofauxiliary speakers it may be desired to use with the machine. The use oftwenty teeth permits a maximum of nineteen auxiliary speakers 28 to beused with one main sp'eakerli;

Mounted on the shaft 15|, between the adjacent faces of the ratchetwheel |82 and the intermediate arm 116C of the U-'sliaped frame |15,there is a coil spring 16d, see Fig; ll. That'coil spring 155 has oneend attached to the ratchet wheel |32 and its other end attached to theintermediate arm |16C to turn the ratchet wheel |82 and in turn theshaft 181 into a position in which a pin 155 carried by the ratchetwheel |82 engages a stop member |55 which projects from 13 theintermediate arm |186. The engagement of the pin |85 with the stopmember |86 restrains the coil spring |84 from turning the ratchet wheelfurther in a counterclockwise direction as viewed in Figs. and 18.

Mounted on the outer face of the intermediate arm |18c of the U-shapedframe |18, there is a spaced pair of insulation plates |81 and 88. Thoseplates |91 and |88 are secured to the intermediate arm |18c by screws|89 which pass through holes in the corners of the plates |81' and |88and which are threaded into the intermediate arm |180. The plates 91 areretained spaced from each and from the intermediate arm |186 by means ofbushings |98 positioned on the screws |89.

The insulation plates |81 and |88 are formed with concentric holes |9|,see particularly Fig. l1,

through which the shaft i8! freely extends. The insulation plate |81,concentric with its hole |95, is provided with a plurality of contactpins |92 arranged in a circle. The insulation plate |99, likewise, isprovided, concentric with its hole |9i, with a plurality of contact pins93 also arranged in a circle. The pins i92 and |93 are mounted throughthe respective insulation plates, as illustrated in the case of the pin|92 in Fig. l2, to have electric leads soldered to those pins at theouter faces of the insulation plates |91 and |88. On the drawings, thegroups of pins |92 and |93 are illustrated as being twenty in number;one pin in each group for one of the ratchet teeth |82a of the ratchetwheel |82. Again, the number of contact pins in each group is arbitraryfor the same reasons explained in connection with the teeth of theratchet wheel |82. In the embodiment of the sound producing apparatusshown on the drawings, only ve auxiliary speakers 28 are shown in usewith the main speaker 49 making a total of six speakers in all, so thatonly siX contact pins in each group are being used. The number ofContact pins used will increase with the number of auxiliary speakersused and the only change in the selector switch |43 will be thesubstitution of a manually operative part having a greater number ofcontact strips-similar to the contact strips |94 to |59-and acorresponding greater number of possible settings of the knob |52.

Positioned on the shaft |8| between the adjacent faces of the shaft |8|,there are metallic contact arms |94 and ISE-the arm |94 for engaging thecontact pins |92 and the arm |95 for engaging the contact pins |93. Theinner ends of the arms 94 and |95 are sandwiched between insulativefiber discs |96 with the arms and the discs being secured together bymeans of rivets |91, see Fig. 11. The fiber discs |96 are formed withconcentric holes to have a snug iit on the shaft |8|, but the arms |94and |95 are formed with slightly enlarged holes to have the shaft |8|pass therethrough without making electrical contact therewith, all asshown in Fig. 11. The arms |94 and |95 are retained in the desiredspaced positions on the shaft |8| by means of tube sections |98 engagedon the shaft |8| between the adjacent faces of the arms and on oppositesides of the arms. All of the parts are retained in position on theshaft I8! by means of a nut |99 threaded onto a reduced outer endportion of the shaft |8| with a washer 290 on that reduced outer endportion between the nut |99 and the outermost tube section |98, see Fig.11.

The arms |94 and |95 are made of exible 14 spring metal and have theirfree outer ends canted to bear with good electrical contact against thecontact pins |92 or |93 of the respective group.

Provided for making electrical contact with the contact arms |94 and |95there are finger members 29| and 202; with the finger member 29|engaging the arm |94 and the nger member 292 engaging the arm |95. Eachof the nger members 29| or 202 has one end secured to the respectiveinsulation plate |81 or |88 by means of a rivet 203. The rivets 203extend completely through the respective insulation plate, as clearlyillustrated in the case of the rivet 203 in Fig. 11, to have electricleads soldered to the ends thereof at the outer faces of the insulationplates |81 and |88. The free ends of the finger members 28| and 292 arebent to bear with good electrical contact against the adjacent faces ofthe arms |94 and |95 in al1 of the rotative positions of those arms.During rotation of the arms |94 and |95, it will be appreciated thatthose arms move freely over the nger members 29| and 202 withoutinterference therefrom.

Mounted on the inner face of the bottom arm |18b of the U-shaped frame|18, there is a change relay 294, see Figs. 5, 8 and 18, for advancingthe ratchet wheel |82 one tooth |82EL each time the coil 295 of thatchange relay is energized. Movement of the ratchet wheel |82, yby thechange relay 204, is in a clockwise direction, as viewed in Fig. 5, inwhich the pin |85 moves away from the stop member |89. The arms |94 and|95, as viewed in Figs. 9, 10 and 18, vwill be similarly moved in aclockwise direction to advance those arms from one contact pin to thenext. The positions of the arms |94 and |95, shown in those Figs. 9, 10rand 18, is the normal position for those arms when the pin |85 isagainst the stop member |86.

To accomplish rotative movement of the ratchet wheel |82 the desired onetooth for each energization of the change relay 294, there is pivotallymounted on the body of that relay a metallic arm 299 arranged to beattracted toward the coil 285 by the core thereof when that coil isenergized. The arm 299 is pivotally retained in position on the body ofthe change relay 294 by means of a bolt 291 and is pivoted in adirection away from the coil 205 by a contraction spring 298. Mounted onthe arm 298 to` swing in a direction at right angles to the direction ofpivoting of the arm 208, there is a lever 299 which is pivotally mountedon the arm 206 by a pin 2I0. The pivotal movement of the lever 299 islimited to a narrow arc by spaced pins 2|| which project from the arm20E. An intermediate portion of the lever 299 is located between thepins 2|| and a bar 2|2 is mounted -between the free ends of the pins 2||retaining the lever 209 extended paralled to the arm 296 and retainingthat lever against any possible movement in a direction away from thearm 298.

The free end of the lever 209 is bent at right angles to the end thereofwhich is pivotally mounted on the arm 206 to engage between adjacentteeth |82a of the ratchet wheel |82v and cause that wheel to be advancedone tooth each time the arm 299 is pivoted. The pivotal mounting of thelever 209 on the arm 295 takes into account the arc through which theteeth of the ratchet wheel |82 move and a spring 2 I3 is provided forpivoting the lever 209 toward the teeth of the ratchet wheel. Thatspring 2|3 operates between the lever 209, closely adjacent its i5?freeend, and alu'g 2.1.4: cutfromJthe intermediate arm.118..

A: pawl 215 pivotally mounted on aV post 2.16,

see Fig. 8, which extends from the intermediate strained by' the. pawl"from'. return movement by;`

its. springv 1 811.

Electricallyk operatedV means. isr provided; for moving the pawl 21.52tol an inoperative position` against the actionof its spring 211 to freethe.

ratchet` wheel 1821tobe returned tol its starting position? by itsspring.v 182, when. an operating.

cyclefor whichthe selector switch 1'53- has been set has beencompleted'. That electrically operL ated meansl comprises'. a releaserelay 2.18 mounted-on a. bracket arin219: cut from. ther top armtl'la ofthe U-shaped frame 111i; Pivotally" mounted onY the body ci the releaserelay 21B', thereis a plate 22e which is urged avvayifromithe. coll 221of the release relay by av contraction` spring 222; seev Fig. 5.. Whenthe coil 221: of. the relay 212- is energized, the plate 221jwill.beipiv.-

oted toward the coil against the' action. of ther spring 222. The plate221i: is formed at its free end witha progecting'lug 223, see Fig. 8,disposed to engagey thev free end. orn4 the paWl. when` the plate 22e ispivoted against the actionof the spring222. Engagement of the lug 223with the pawl 2:15: pivots that paWl against theaction ofl the spring21'1 moving the paWl clear. of thev teeth:

132.a of the ratchet. Wheel 132. so thatthe spring 18.4 can. turn theWheel bac-k in acounterclock,-

Wise.: direction as' viewe'din Fig. 5, until the piny It; being..rappreciated that in allinoperative or deenergized` 135V reengages thestop member 1.85.`

positions of the change relay 264, the leverr218 is.. clear ofv theAratchet teeth 182.a sol that the ratchetwheel 122 is: free-tov be'turned back by the'. spring idd'. Back rotation of the ratchet wheel122.- causes the shaft. 18-:1 to be similarly turned returningithe:contact arms 19ty and 125 to their. starting positionsv illustrated in1figs. 9,'.10..and 18.Y

From the foregoing description ojthecconf1 struction of. the, manuallyoperative part and the` electrically operated part of. the. selectorswitch 143 it is believed that the operation of the switch will beVclear. The electrical connections to the various parts of that switchwill be given as the speciiication proceeds.

The ,essential parts of the amplifier circuit are shown in theY Fig. 17section of the schematic wiring diagram. rilhat ampliercircuitis dividedinto` parts consisting of'alsound circuit: ricade` up of adup'leXQdiode-triode tube a beam power,

amplifier. tube 225. and a sound output trans.- former 22S anda:v signalcircuit made upoia duplex-diode-triode tube 221, a beam'v power..

'amplifier tube 22:8 and a signal output. trans-v former 229 forenergizing the coil 2311 of 'a signal relay 231. The dupleX-diode-triodetubes 2211- a-nd 221 are alikein construction and each has a plate232,agridv 233, a diode plate 234, avcathode 235. anda heater 236. Thediodeplates` 23d and the cathodes 235 are .tied togetherbyyleads, 231.

The two. beam power amplier tubes 225 and 228 are also alike inconstruction and each includes a plate 238, a screen 239, a grid 21111,a cathode2fi1 and a heater' 242. Also, included in the amplier circuitthere is a triode tube 24st having a plate 21H1, a grid25, a cathode20,6. anda heater 261.

A circuit is provided for causing the heaters 235, 242 and 2M. of thetubes to be' energized the moment the master switch el is closed so thatthe amplier circuit Will be ready for instant use the moment the masterrelay 52 is energized bringing the remainder of the anipiiier circuitinto operation. rihat circuit for the heaters oi the. tubes includes a.filament transformer 243 havingthe. usual primary 2:19 and secondary25d.

-A lead 251, see Figs. 16 and 1'?, has one end connected to. one side ofthe primary 229 oi. the transformer 243. The other end of the lead 251is. connected to thelead f1 between the contact "15 and the lead 69; Theother side of theprimary 249 of the transformer 24S is ground by a lead252. Thus, when the switch 6'.' is closed, current for energizing theprimary 2119 of the transformer 2113` passes along the lead t1, the lead156 Y, through the closed master switch si, to the grounded lead 63, tothe grounded lead 252, through the primary 229, along the lead 251 tothe lead Si, to the lead ed and the lead 62 back to the source.Extending from the secondary 2511 ofV the lament transformer 2F18 thereare parallel ,leads 253 and 25d connected atv their'free ends to theheater 2&2 o1 the tube 228. Parallelly connected leads 255 extend fromthe leads. 253 andi 2511 to the heater 2112 of the tube 225, withsimilar leads` 2% extending from the leads 253 and 25s to the heater236101 the tube 224'. Parallel leads 251' connect the heater 231i of thetube 221 to the leads 253 and 255.- with the heater 25)'1 of the tube2i3 connected to the leads2i53 and 2511 byv leads 258. IZfhus, all ofthe heaters of thetubes are connected in parallel with the secondary25)A of the filament transformer 2115 so that upon energization oftheprirnary 2515i all of the heaters will be energized.

They transcribing arm 33 carries the usual electrical parts, not shown,for converting, Vibrations. of theneedle 3B in the record groove intoelectrical vibrations as is generally known in the art. One side of thatelectrical mechanism of the transcribing arm 3&3 is grounded through aleadv 256. Extending fromthe. other side'of the electricalmechanisrnusee Fig,r 17, there vis a lead 2613fconnected to one. end ofthe winding. 261 of a variable volume control 2i2 for the sound. cirncuit portion. ofthe amplier circuit. The othery side *of the vwindingitiisv grounded throughy a lead 263. The adjustable. arm 2151i of. thevolume control 232 is connected to the'grid 233 of the tube 22H by-alead25. rlhevolurne control 2&2 is manually adjustable bymeans of a knob235 positioned aboveV the. top Wall. 32,. see- Figs. l, 3.. and .4.

A- branch. lead, 2537' from the. lead 221lisconnectedto one end oi thewinding 2280i asignal excitation Volumev control 252. The other. end ofthe Winding 22S is grounded. through. a. lead 211i,` The adjustable arm211 vis connected byv a lead 212 toy the grid233fofl the. tube 2271. Thevolume' control 28d has a' control knob 213 exposed above the'top facevof the top Wall to be turned to adjust the sensitivity of the signalfrom the recordto a proper leveltoexcite theicoil23il of the signalrelay 231. The knob 213 carries an indicator plate 216i which registerswith a pointer 2.715? mountedonlthetop faceiof the topiwall 42,

see Fig. 3. A screw type adjustable lock 216 mounted on the wall 42 isarranged to be tightened against the periphery of the indicator plate215 for securing the knob 213 in the properly adjusted position of theexcitation Volume control 299 so that the signals will be passed to thesignal relay 23| at the proper level to excite or energize its coil 239.

Extending from the cathodes of the tubes 224, 225, 22's' and 22S thereis a grounded lead 211 which includes in series a resistor 218. Aparallel lead 229 is connected at its ends to each of the leads 21'!J atopposite ends of the resistors 218 and those parallel leads 219 includein series condenser-s 299. Connected to the cathode 249 of the tube 243,there is a grounded lead 28| which includes in series a resistor 282. Alead 283 is connected at one end to the lead 28| at the grounded end ofthe resistor 282 and has its other end connected to the grid 245 of thetube 243. The lead 233 includes in series a resistor 284. Extending fromthe plate 232 of the tube 224, there is a lead 235 which includes inseries a condenser 239 and which lead 285 is connected at its other endto the grid 249 of the tube 225. A grounded lead 281 is connected to thelead 235, between the condenser 289 and the grid 249, and includes inseries a resistor 238. A lead 239 from the plate 233 of the tube 225 isconnected at its other end to one end of the primary 299 of the outputtransformer 229. The lead 289 has one end of a grounded branch lead 29|connected thereto and which includes in series a condenser A lead 293 isconnected at one end to the other side of the primary 290 of the soundoutput transformer 223 and has its other end connected to the screen 239of the tube 225, to excite the primary 29| of the output transformer.

A lead 293 extends from the plate 232 of the tube 22'? and is connectedat its other end to the grid 2311i of the tube 228. The lead 294includes in series a condenser 295. Connected to the lead 2353 betweenthe condenser 295 and the grid 240, there is a grounded lead 295 whichincludes in series a resistor 291. Extending from the plate of the tube228, there is a lead 298 which is connected to one end of the primary299 of the signal transformer 229. A grounded lead 309 is connected tothe lead 298 between the plate 238 and the primary 299 and includes inseries a condenser 39 i. A lead 392 from the other side of the prima-ry293 of the signal output transformer 229 is connected to the screen 239of the tube 228 to excite the primary 299 of the signal outputtransformer 229 when the needle 38 of the transcribing arm picks up asignal from the record and in accordance with the setting of theexcitation volume control 269. The secondary 393 of the signal outputtransformer 229 has a lead 394 connested to one end thereof with theother end of the lead 394 connected to one side of the coil of thesignal relay 23|. A lead 395 from the other side of the coil 23|] isconnected to the other side of the secondary 303 completing the circuitfrom the secondary through the coil 239 to energiae the coil each time asignal is picked up by the needle 38. The lead 395 includes in series aselenium rectiier 399. Also connected to the lead between the coil 230and the rectier 399, there .is a lead 391 which is connected at itsother end to the lead 394 and which includes in series a condenser 398.

The signal relay 23|, in addition to the coil 230, has a pivotallymounted arm 309 which is grounded through a lead 3|9. When the coil 23D18 is deenergized, as shown in Fig. 1'1, the free end of the arm 399 isclosed against a contact 3| However, when the coil 230 is energized, thefree end of the arm 399 is pulled over to make electrical contact with acontact 3 |2.

The circuit from the master relay 52 for energizing the completeamplifier circuit when the coil 53 of that relay is energized, can betraced along a lead 3|3, see Figs. 16 and 17, which is connected at oneend to the contact 59 of the master relay 52 and at its other end to aresistor 3|4. A lead SI5 connects the other end of the resistor 3| toone side of a selenium rectiier 3|6. The other side of the rectifier 3|6is connected by a lead 3|1 to one side of a resistor 3|8. A lead 3|9from the other side of the resistor 3|8 is connected to the same side ofthe primary 290 of the output transformer 22B to which the lead 293 isconnected. A branch lead 32D from the lead 3|9 is connected to the sameside of the primary 299 of the signal transformer 229 to which the lead392 is connected.

Branch leads 32| and 322 are connected to the leads 3 1 and 3|9 onopposite sides of the resistor 3|B and each of the leads 32| and 322includes in series a condenser 323. The other ends of the leads 32| and322 are grounded through a common lead 324. A lead 325 connected to thelead 39, outward of the resistor 3|8, is connected to the lead 294between the plate 232 and the condenser 295 and includes in series aresistor 326. A lead 321, similar to the lead 325, is connected at oneend to the lead 3|9 and has its other end connected to the lead 235between the plate 232 and the condenser 286. The lead 321 includes inseries a resistor 328.

Also, connected to the lead 3|9, there is a lead 329 which is connectedat its other end to one side of the coil 339 of a normally open platerelay 33|. A lead 332 connects the other side of the coil 339 to theplate 244 of the tube 243. The plate relay 33| includes an arm 333 whichis inoperative when the coil 339 is deenergized but which is closedagainst a contact 334 when the coil 339 is energized. Extended from thelead 332, thereY is a grounded branch lead 335 which includes in seriesa condenser 335. A lead 331 connected at one end to the lead 335,between its grounded end and the condenser 339, has its other endconnected to the arm 333 of the plate relay 33|.

The moment the coil 53 of the master relay 52 is energized byenergization of the control relay 14 as previously described, the arm 55will be pulled over to electrically engage the contact 59. Current forthe amplifier circuit will then come from the source along the lead 62,the lead 99, the lead 91, the lead |99, through the arm 55, the contact59, the lead 3| 3 to the resistor 3|4 and from there into the Variousparts of the amplier circuit. The current from the amplifier circuitwill double back to the source through the various grounded parts of theamplier circuit to the grounded lead 98, the lead 95, the closed masterswitch 31 and the lead 6 Pivotal movement of the arm 55, uponenergization of the coil 53 of the master relay 52, causes the arm tomove away from the contact 51 breaking the circuit through the signmotor |92 and the sign 25. However, the auxiliary circuit previouslyreferred to now goes into operation to cause the sign 26 to becontinuously illuminated, without flickering, during the time that theamplifier circuit is in operation. That auxiliary circuit can be tracedalong the lead 62, onto the lead 99, the lead 91, the lead |99, the

arm 55, the contact 53 into the lead'3l3. To the lead 323 there isconnected one end of a lead which is connected to the lead H8. Thus, thecurrent passes from the lead 3I3, along` the lead the lead H8, the leadH3, the light bulbs 93, the lead H2, the lead H7, the lead lll, the lead55, through the closed master switch "Bl and the lead 5l back to thesource.

There is the probability that when the arm 55 moves away from thecontact 5T, the sign motor will be stopped in a position in which thecontacts 03 and lill of the flicker switch H35 are in a closed position.With those contacts closed current passing through the lead 338 willdivide at its point of connection with the lead lid passing through theclosed contacts H36 and along the lead M3 and the lead Il!) to the signmotor energizing the same to rotate the cam E53 with the arm 55 engagingthe contact However, that energization of the sign motor ii2 will onlycontinue until the high point HM on the cam E33 opens the flicker switchE05 breaking the circuit through the motor H12 deenergizing the sameleaving the auxiliary circuit to continuously illuminate the sign 26 asvlong as the master relay 52 is energized.

Energization of the master relay 52 to close the arm 55 against thecontact 59 will also cause the turntable 35 upon which the disc record3l is rested to be rotated by a turntable motor 339, see Fig. 1G. Oneside of the turntable motor 339 is connected by a lead 343- to the leadSH3. The other side of the turntable motor 339 is grounded through alead 35i. With the master relay 52 energized the circuit for theturntable motor 333 can be traced along the lead 62, the lead 69, thelead l, the lead E35, the arm 55, the contact the lead BH3, the lead345, through the turntable motor 333, through the grounded lead 31H, tothe grounded lead 53, the lead 66, the closed Imaster switch 5l' and thelead 6l back to the source.

With energization of the turntable motor 339, the turntable 35 will berotated and the usual mechanism, not shown, of the automatic recordplayer 33 will cause the transcribing arm 35 to be liited placing theneedle 38 in the start of the sound track or groove cut in the face ofthe record. As the turntable 35 with the needle 33 engages the record,the rst message of the record will be picked up by the needle 38 and fedthrough the amplier circuit to the primary 295 of the sound outputtransformer 226. That output transformer 225 includes a secondarywinding 3&2 which has one side connected by a lead 333 which in turn isconnected to the spring nger 232 of the selector switch |43. The otherside of that secondary winding 342 is connected by a lead 34d to thecontact 3H of the signal relay l which is engaged by the grounded arm353 in the deenergized position of that relay 23H.

rThe iinger 232, to which the lead 343 is connected, is in continualengagement with the arm 595 in all of the turned positions of that arm.When a cycle of the sound apparatus is started by energization of themaster relay 52, that arm H35 is always in contact with the firstcontact 53 of the set carried by the insulation plate l88 regardless ofwhether the changeover switch I is in its number l or its number 2position, as shown in Figs. 10 and 18. That first contact engaged by thearm |95 is connected by a lead 3&5 to one side of the main speaker 46positioned within the control box behind the grille 45. The other sideof the main speaker 46 is grounded through a lead 3116. The Amovement ofthe sound signal from the secondary 3&2 of the out-- put transformer 226through the main speaker i6 can be traced along the lead 333, throughthe spring ringer 232, the arm 95, the contact N3 engaged by the armE55, along the lead 345, through the speaker 46, through the groundedlead 3&3, to the grounded lead 3l@ (Fig. 17), through the arm 369, theContact 3l! and the lead 3M back to the secondary 352. The outputcircuit of the transformer 226 is grounded through the arm 259 of thesignal relay 23l, so that when the signal relay is energized by a signalon the disc record 3l the arm 35s will move away from the contact 3Hmomentarily breaking the output circuit so that the signal will not beplayed through the speakers.

Provided for concurrent use with or for use in place of the main speaker46, there is an auxiliary main speaker Sill, shown diagrammatically onlyin lFig. 18. That auxiliary main speaker Sill is a unit separate fromthe control box 25 for use away from that box and is connected by a pairof leads 338 to a switchboard-type plug 35H3. The plug 349 is arrangedto be inserted into a switchboard-type jack 355 mounted through the rearwall of the metallic container d5, see Fig. 2. One side of the jack 35uis connected by a lead 35i to the lead SL35 and the other side of thejack is grounded through a lead 352. Connected in series in the lead345, between the point of connection of the lead 35| and the mainspeaker 15, there is a switch 353 of the toggle type which is normallyleit closed, as shown in lFig. 18. The switch 353 is also mountedthrough the rear wall o1 the metallic container 33, as shown in Fig. 2,where it can be conveniently reached to be opened and closed.

With the arm E55 engaging the rst contact 53 completing the outputcircuit of the transformer 22E through the lead M5, and with the plug349 plugged into the jack 355, both the main speaker i6 and theauxiliary main speaker 34? will play the rst message of the disc record.However, if the switch 353 is opened, only the auxiliary main speaker 3Mwill play the first message. Thus, it is apparent that with the plug 359inserted into the jack 555, the auxiliary main speaker 34? will be incontinuous operation with only the operation of the mainspeaker i3 beingeffected by the position oi' the switch 353.

The connections from the arm E35 so that the second, third, fourth, fthand sixth messages will be successively played through the auxiliaryspeakers 23 as the arm E35 is caused to step from contact |93 to contactH33 by energization of the change relay 2134i, are shown in Fig. 18.

Each of the auxiliary speakers 28 connected by leads 355 toswitchboard-type plugs 355. Each plug 355 is to be inserted into acorrect one of five different switchboard-type jacks 35i, 358, 353 and365 mounted through the rear wall of the metallic container i3 as shownin Figs. 2 and 3. One side of the iirst jack 35i? is connected by a lead35i to the second contact of 'the group of contacts E93 and has itsother side grounded through a lead 332. rIhe second jack Sl has one sideconnected to the third contact of the group of contacts E93 by a lead353 and its other side grounded through a lead 35d. The third jack 358has one side connected to the fourth contact of the group of contactsH53 by a lead 355 and its other side grounded through a lead 335. Thefourth jack 359 has one side connected to the fifth contact of the groupof contacts E93 by a lead 367 and its other side grounded through a lead368. The fifth jack 360 has one side connected to the sixth contact ofthe group of contacts |93 by a lead 369 and has its other side groundedthrough a lead 378. Thus, when the arm |95 is caused to step from theiirst contact into engagement with the second contact of the group or"contacts |93, the sound signal from the secondary 342 of the outputtransformer 226 (Fig. 17) will be fed to the arm |95 along the same pathoutlined in connection with the main speaker 45. However, from the arm|95, that sound signal will be passed through the second contact 193 tothe lead 36|, through the rst auxiliary speaker 28, through the groundedlead 362, then to the grounded lead 3 I6, through the arm 359 and baci;to the secondary 342 as described in connection with the main speaker,so that the second message of the record is placed through the firstauxiliary speaker 28. Similarly, the path of the third, fourth, etc.messages of the record can be traced through the second, third, etc.auxilary speakers 26.

The number of speakers that will be in operation during any one cycle ofoperation of the reproducing apparatus, with the changeover switch |28in its number l position, will be directly controlled by the setting ofthe selector switch Returning again to the energization of the masterrelay 52 upon energization of the control relay 74 by stepping on thefoot pad 27 or pressing of the auxiliary switch 95, a circuit isprovided whereby the master relay will retain itself energized even ifthe person should step ofi the foot pad 27 or release the auxiliaryswitch 95. That circuit will act to maintain the master relay 52energized until the circuit is broken by opera-tion of means to :behereinafter described controlled by the signal relay 23|.

The circuit for maintaining the relay 52 energized includes the arm 54of that relay regardless of whether the changeover switch is in itsnumber l or its number 2 position. When ie reiay 52 is deenergized, asshown in Fig, 16, that arm 54 is inoperatively engaged with the blanl;contact 55. However, the moment energization of the master relay 52 iseffected, the arm 54 moves over and contacts the contact 58 of themaster relay 53. That Contact 59 is connected by a lead 37| to the lead97 between its points of connection with the contact 78 and the lead 69.A lead 372 (Figs. 16, 17 and 18) is connected at one end to the arm 54of the master relay 52 to the contact strip |4| of the changeover switchIn the number l position of that changeover switch |20, that contactstrip i4! is engaged by the projection |48 of the half ring |37 andwhich in turn is engaged by the contact strip |35. From the contactstrip |35 there extends a lead 373 (Figs. 16, 17 and 18). The other endof the lead 373 is connected to one side of a normally closed shut-offswitch 374, see Fig. 16. A lead 375 connected to the other side of theswitch 374 is connected to the lead between the arm 75 and the coil 53of the master relay 52.

IThus, with the changeover switch in its number l position, the circuitfor maintaining the master relay energized after the control relay 74 isdeenergized, can be traced from the source through the lead the lead 69,the lead 97, the lead 371 to the contact 58, through the arm 54, thelead 372 to the contact strip |4| and out on thecontact strip |35, tothe lead 373, through the closed shut-off switch 374 along the lead 375to the lead 96. With the control relay 74 deenergized the arm 75 will bemoved away from the contact 76 so that the current in the lead 96 willbe fed into one side of the coil 53 of the master relay 52 and out ofthe other side to the lead 66, through the closed master switch 67 andthe lead 6| back to the source. In that number l position of thechangeover switch |20 that circuit through the coil 53 of the masterrelay 52 will be maintained until the switch 374 is momentarily openedbreaking the circuit deenergizing the coil 53 and freeing the arms 54and 54 to move back to engage the contacts 55 and 57, respectively.

For opening the shut-off switch 374, it is connected to the reject arm39 of the automatic record player 33, as diagrammatically illustrated bythe insulation piece 375 in Fig. 16. The reject arm 39 is connected tothe core oi a reject solenoid 377 having a coil 378 so that when thecoil 378 is energized, as will be hereinafter described, the reject arm39 of the record player 33 will be pulled over and in turn momentarilyopen the switch 374 breaking the circuit through the coil 53.

In the number 2 position of the changeover switch |28, the path of thecircuit for retaining the master relay 52 energized after the controlrelay 74 is deenergized, is through a shut-oli relay 379, see Fig. 18,having a coil 388 and an arm 38| closed against a contact 382 when thecoil 380 is deenergized. It is appreciated, of course, that when thechangeover switch is turned to its number 2 position, the projection |49of the half ring |37 moves out of engagement with the contact strip |4|and into engagement with the contact strip |42. The contact strip |35engages the half ring 37 in each of the positions of the half ring |37.

To complete the number "2 position circuit, the arm 38| of the shut-offrelay 379 is connected by a lead 383 to the lead 372. The contact 382 ofthe shut-off relay 379 is connected by a lead 384 to the contact strip|42 of the changeover switch |20. In the number 2 position of thechangeover switch the circuit will be traced from the source through thelead 62, the lead 69, the lead 97, the lead 37| to the contact 58,through the arm 54 into the lead 372. The current cannot continue alongthe lead 372 because the projection |40 is out of contact with thecontact strip |4| so the current passes from the lead 372 into the lead383, through the arm 38| of the shutoff relay 379, into the contact 382,along the lead 384 to the contact strip |42, out of the contact strip|35, along the lead 372, through the closed shut-off switch 374, alongthe lead 375, to the coil 53, along the lead 66, through the closedmaster switch 67 and the lead 6| back to the source 6|. In the number"2, that circuit through the master relay 52 will be maintained as longas the arm 38| maintains its engagement with the contact 382. However,when the coil 380 of the shut-off relay 279 is energized, as will behereinafter explained, the arm 38| will be pivoted away from the contact382 breaking the circuit through the master relay 52 causing the same tobe deenergized.

It is appreciated that, in the number "1 position of the changeoverswitch |20, the current for maintaining the master relay 52 energizedcannot pass through the arm 38| of the shut-off relay 379 because theprojection |40 is out of contact with .the contactstrip, |,42,as shownin Fig. 18.

Turning now to the signal relay 23|. there is extended from its contact31,2, which is engaged by arm 399 when the coil of signal relay isenergized, a lead 335 (Figs. 17 and 18) which is connected at its otherend to the contact strip |29 of the changeover switch |29 which is incontact with the contact ring |30 in each of the two positions of thatchangeover switch. Extending from the contact strip |33 of thechangeover switch |20, there is a lead 336 which is connected at itsother end to the one side of the coil 380 of the shut-off relay 319.Extending from the contact strip |32 of the changeover switch |20, thereis a lead 381 which is connected at its other end to a coil 388 of asupply relay 389. The supply rel-ay 399 is a normally open relay havingan arm 390 which moves over into electrical engagement with `a contact33| when the coil 389 of the supply relay 399 is energized.

The contact strip |34 of the changeover switch |29 is connected by alead 392 (Figs. 16, 17 and 18) to one side of the coil 316 of the rejectsolenoid 311. Extended from the other side of that coil 318 there is alead 393 which is connected at its other end to the lead 3|3 between thecontact 59 and the resistor 3|4. The lead 393 includes in series aresistor 394 and a selenium rectifier 395 to feed D. C. current from theA. C. source to the coil 318. Connected to the lead 393, between thecoil 318 and the rectier 395, there is a grounded lead 396 whichincludes in series a condenser 391.

Extending from the contact 334 of the plate relay 33 which contact isengaged by the a-rm 333 of that relay when its coil 339 is energized,there is a lead 398 (Figs. 17 and 18) which continues into branch leads39S2L and 398i. The branch lead 399a is connected to one side ofthecoil'22 of the release relay 2|8. The other lead 398b vis connected atits free end to one side of the coil 399 of a normally open auxiliaryrelay 43|). 'The relay 439 further includes an arm 49| arrangedto bemoved into electrical contact with a contact 492 which is groundedthrough a lead 493. The arm 49| of the auxiliary relay 399 is connectedby a lead 494 to the contact strip |39 of the changeover switch |20.

The arm 339 of the supply relay 389 is grounded through a lead 493. Thecontact 39| of that relay 389, which is engaged by the'arm 39|) when therelay is energized, is connected by a lead 493 to one side of the changerelay 204. Extending from the lead 313, see Fig. 17, there is a lead 491(Figs. 17 and 18). One branch lead 431a from the lead 491 is'connected`to the coil 399 of the auxiliary relay 49|?. Another branch lead 491bfrom the lead 491 is connected to the coil 339 of the shut-oli relay319. Still `another branch lead 491c from the lead 401 is connected tothe coil 333 of the supplyrelay 399. A branch lead 4919 from the lead491 is connected to the coil 235 of the change `relay 294. Finally, abranch 491e from the lead 4491 Yis connected lto the coil 22| of therelease relay v2|8.

Extending from the 'lead 332, between its'point of connection'with 'thecoil'339 ofthejplate` relay 33| and the plate 244 of the Vtube'243,there is a lead 499, see Fig. 17. The other end of the lead 409 isconnected to one end of a resistor 499. Connected to the other end oftheresistor 409 'there connects thevfirst-of the contact strips 1640i the.4 manually operative part of the selector switch |43 to the rst contactof the group of contacts |92 of the electrically operated part of theselector switch. That first contact |92 is the one engaged by the arm|94 in the starting position of the selector switch |43, as shown inFigs. 9 and 18. A lead 4|2 connects the second contact strip |35 withthe second contact |92. A lead 4|3 connects the third contact strip |39with the third .contact |92. A lead 4|4 connects the fourth contactstrip |61 with the fourth contact |92. The fth contact strip |98 isconnected to the fth contact |92 by a lead 4| 5. The sixth contact strip|69 is connected to the sixth contact |92 by a lead 4|6. The springlinger 29| which is in continual electrical contact with the arm |94 isgrounded through a lead 4|9.

Operation of the sound producing apparatus:

In considering the operation of the apparatus, it is thought that thefollowing phases of the operation will be clear from the foregoingdescription without a further detailed operation at this time:

1. Energization of the 6 volt step-down transformer 1| when the masterswitch 91 is closed.

2. Action of the foot pad 21 and the auxiliary switch 95 in energizingthe coil 13 of the control relay 14 when the master switch 91 is closed.

3. Initial energization of the master relay 52 when the control relay 14has been energized.

4. Action of the arm 34 of the master relay 53 in maintaining the masterrelay energized after the control relay 14 has been deenergized.

5. Illumination of the sign 29 both when the master relay 92 isdeenergized and energized.

6... Energization of the turntable motor 339 when the master relay isenergized.

7. Energization of the heaters of the various tubes of amplifier circuitthrough the filament transformer '249 when the master switch 61 isclosed.

8. Playing of the sound signal from the output transformer 226 throughthe various speakers when the arm |93 is stepped with relation to thecontacts |93.

Accordingly, all that there remains to describe is the action of theapparatus in the various positions of the changeover switch |29 and theselector switch |43 when a signal from the record causes signal relay23| to be excited.

First, let us assume that the changeover switch |29 is in its number lposition and that the selector switch |43 is in its off position shownin Figs. 3 and 18. In that position of the switches |29 and |43, thefirst message of the record 31 will be played through the main speaker49 and/or the main auxiliary speaker 341, depending upon the position ofthe switch 333 and whether or not the plug 349 is inserted into the jack359, all as previously described. When the signal from the record causesthe coil 239 of the signal relay 23| to be energized, the arm 399 willimmediately be attracted by the coil '239 away from the contact 3|| andinto electrical contact with the contact 3|2. This action of the arm 399away from the contact 3|| will momentarily break the output circuit fromthe output transformer 229 to the speakers so that the signal sound willnot be played by the speakers, again as previously described. With thearm 339 contact with the contact 312, a circuit through the coil 388 ofthe supply relay 389 is completed causing that relay to be energized.

The circuit can be traced from the source through the lead 6|, theclosed master switch

